物理化学学报 >> 2012, Vol. 28 >> Issue (07): 1751-1756.doi: 10.3866/PKU.WHXB201204233

软物质 上一篇    下一篇

疏水缔合聚丙烯酸与蠕虫状胶束的协同作用

梅拥军1,2, 韩一秀2, 周洪2, 姚林1, 江波1   

  1. 1. 四川大学化学学院, 成都 610065;
    2. 中国民航局第二研究所, 成都 610041
  • 收稿日期:2012-01-15 修回日期:2012-04-23 发布日期:2012-06-07
  • 通讯作者: 江波 E-mail:jiangbo@scu.edu.cn
  • 基金资助:

    国家自然科学基金-民航联合基金(60979020, 60939001)资助项目

Synergism between Hydrophobically Modified Polyacrylic Acid and Wormlike Micelles

MEI Yong-Jun1,2, HAN Yi-Xiu2, ZHOU Hong2, YAO Lin1, JIANG Bo1   

  1. 1. College of Chemistry, Sichuan University, Chengdu 610065, P. R. China;
    2. The Second Research Institute of Civil Aviation Administration of China, Chengdu 610041, P. R. China
  • Received:2012-01-15 Revised:2012-04-23 Published:2012-06-07
  • Contact: JIANG Bo E-mail:jiangbo@scu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China and Civil Aviation Administration of China (60979020, 60939001).

摘要:

从宏观流变性和介观尺度方面, 研究了疏水缔合聚丙烯酸(HMPA)与油酸钠(NaOA)构筑的蠕虫状胶束的协同作用. 考察HMPA对蠕虫状胶束溶液流变性和表观粘度的影响, 结果表明, 极少量HMPA的引入导致蠕虫状胶束溶液体系动态模量明显增加; 其表观粘度随HMPA浓度的增加先增强后减弱. 另一方面, 通过耗散颗粒动力学(DPD)分子模拟方法研究了混合体系中溶液组成对HMPA分子链的均方根末端距的影响. 结果表明,随着NaOA浓度增加, HMPA的均方根末端距会出现峰值; HMPA的伸展程度受其自身浓度变化制约, 相对于纯HMPA体系, NaOA胶束的存在对高浓度区的HMPA伸展程度影响更明显. 结合流变实验和分子模拟结果,初步解释了聚合物与蠕虫状胶束的协同作用机制.

关键词: 疏水缔合聚丙烯酸, 蠕虫状胶束, 流变性, 表观粘度, 耗散颗粒动力学分子模拟, 均方根末端距

Abstract:

The synergism between wormlike micelles formed from sodium oleate (NaOA) and hydrophobically modified polyacrylic acid (HMPA) was investigated according to their macroscopic performances and mesoscopic scales, using a combination of viscosity/rheology measurements and dissipative particle dynamics (DPD) molecular simulations. The rheology of NaOA wormlike micelles changed significantly following the addition of a small amount of HMPA, which verified the synergistic effect between them. A peak in the apparent viscosity was observed following an increase in the concentration of HMPA, suggesting that the synergistic effect was restricted by the composition of the mixture. A DPD simulation also confirmed that the solution composition had an influence on the root mean square (RMS) end-to-end distances of HMPA, with the observed value fluctuating according to NaOA and HMPA concentrations. The micellar morphology affected the RMS end-to-end distances of HMPA and the presence of NaOA micelles exerted a significant impact on the extension of HMPA at high HMPA concentrations. A proposed synergistic mechanism has been presented according to the experimental and simulation results.

Key words: Hydrophobically modified polyacrylic acid, Wormlike micelle, Rheology, Apparent viscosity, Dissipative particle dynamics molecular simulation, Root mean square end-to-end distance

MSC2000: 

  • O641